Two improvements needed for Dorico:
1) Dorico should incorporate into Dorico itself a program that converts pdf files of scores into both musicXML and Dorico files.
I am fully aware that there are a few (bad) programs that do that but they are not very good. More, I strongly believe that it should be part of any good notation program.
A notation software program should be much better at creating such a converter from pdf files into both musicXML and Dorico files.

2) musicXML should be guided by the Dorico experts to become a format that is much better than it is now, in particular a format that is much more accurate, faithful to what was originally on a notation program X when generated on a notation program Y using a musicXML file.
Say notation software X converts the score into musicXML and then you use this musicXML file to input into a notation software Y. The problem? The score originally from notation software X sometimes varies too much from the score that is produced into the notation software Y using the musicXML file.